Safety razor



July 6, 1937. G. P. MACKENZ|E SAFETY RAZOR Filed April 10, 1935 ATTOi/Vf) it atented July 6, 1937 IT'ED :S'TATES PATENT OFFICE signor of one-half to Robert Watcrhouse Foster, Rotheriield, England Application April 10, 1935. Serial No. 15,709 In Great Britain April 18, 1934 8 Claims.

The present invention relates to razors of the safety type in which a thin flat blade is held be tween guard and cover plates and which have more than two and preferably three cutting edges which are simultaneously held in position for use.

More particularly the present invention relates to safety razors as hereinbefore defined having a substantially cylindrical boss or projection which is grooved or recessed associated either with the 19 guard plate or with the cover plate for maintaining or holding the cutting edges of the blade in correct position for use and for facilitating attachment of a razor handle and clamping of the blade.

The chief object of the present invention is to provide an improved safety razor of the class describedin which different degrees of out are simultaneously available for use at the several cutting edges thereof.

29 With this object in View the present invention consists in a razor of the class described com prising a guard plate providing straight untoothed edges which lie at diiierent perpendicular distances from the longitudinal axis of said razor,

marginal recesses of the same vertical depth extending inwardly from said edges, 2. cover plate and a blade having at least three cutting edges clamped between said guard and cover plates 80 with its cutting edges simultaneously available for use, whereby different degrees of out are provided at the several edges of the razor.

The guard plate may be made of metal or of any other suitable material; for example it may be moulded from a material such as that known under the registered trade-mark Bakelite.

In order that the present invention may be more clearly understood and readily carried into efiect reference may now be had to the accompanying drawing in which:'

Fig. 1 is an elevational view of a complete safety razor according to the present invention;

Fig. 2 is a plan view of the safety razor shown in Fig. 1;

Fig. 3 is a top plan view of the guard plate;

Fig. 4 is a bottom plan view of the guard plate;

Fig. 5 is a plan view of a blade for a razor ac cording to the present invention;

Fig. 6 is a bottom plan view of the cover plate;

Fig. 7 is a cross sectional view on the line 'i? of Fig. 2; I

Fig. 8 is a cross sectional view on the line 83-8 Fig. 9 is a cross sectional view on the line 9-9 of Fig. 2. i

In Figs. 1-9 of the drawing the present invention is shown as embodied in a safety razor of triangular form comprising a holder constituted by the handle I, the guard plate 2 having straight untoothed edges and the cover plate 3, and a blade l clamped between the guard and cover plates 2 and 3 respectively.

The blade 4 which is relatively stiff and flat and is preferably provided with so-called hollow ground cutting edges 5 bears over most of its surface area upon a substantially fiat surface 6 formed on the guard plate 2 but the cutting edges 5 themselves project over marginal portions 1, 8, and 9 respectively of the guard plate which are recessed to the same depth as shown more particularly in Figs. 7, 8, and 9. The cover plate 3 has a substantially fiat under-surface l0 which bears upon the blade 4 and is provided with a sub- 20 stantially centrally located projection or boss I I. This boss which is of generally cylindrical form is provided with grooves or recesses l2 and cooperates with a correspondingly shaped hole 13 in the blade 4 and with a correspondingly shaped passage Min an extension l5 from one side of the guard plate 2. The boss H has a screw threaded portion l6 on to which the handle I may be screwed for the purpose of detachably clamping the parts together in the manner shown'in Fig. 1, the handle having an annular flange which bears on the edge of the extension IS. The particular form of the boss H, hole 53 and passage l6 described ensures that the edges 5 of the blade are held in correct position during use of the razor.

In accordance with the present invention. the safety razor is constructed in such a manner that when it is conditioned for use different degrees of out are simultaneously provided for at the several cutting edges. This result is obtained in the form or the invention illustrated in Figs. 1-9 by arranging for the straight edges ll, l8, and IQ of the recessed portions 1, 8, and 9 respectively of the guard plate 2 to lie at different perpendicular r distances from the longitudinal axis of the razor as shown more particularly in Figs. 7, 8, and 9.

In this way the cutting edges of the blade are located at different distances from the corresponding edges of the guard plate and the razor 50 has to be held at different inclinations to the face according to which edge is in use thus varying the degree of cut obtainable at the diiferent edges. To provide for the evacuation of soap and hair slots 20 are preferably located behind the edges l I, I8 and I9 and as shown in Fig. 4 the sidewalls I of .these slots may be tapered downwardly to facilitate such evacuation.

If desired the cover plate 3 may beprovided on I one or both of its-surfaces with a marking or indicator 2 lsuch as an arrow-whilst the edges of the guard plate 2 may be designated by being numbered I, 2, 3,.as shown in Fig. 4 or by being otherwise marked. Furthermore the cutting edges of the blade may be marked on one face with the markings Monday, Tuesday and Wednesday respectively and on the other face with the markings Thursday-Sunday, Friday and Saturday respectively. The eifect of these markings is to enable a different cutting edge of the blade to be used on successive days with the f cover plate 3 and handle I may be made of any suitable material.

In a modified form of the invention" the guard plate and the handle may be formed in one piece and the parts may be detachably clamped together by means of a spindle which projects through the handle and has a threaded ,end adapted to screw into the boss on the cover plate. The spindle may be rotated to eifect clamping or unclamping of the parts by means of a disc having a milled edge formed integrally with or secured to thespindle. I V 1 1 WhatIclaimis:- i 1.1 A safety razor of the class described comprising a guard plate providing straight untoothed edges which lie at different perpendicular distances from the longitudinal ,axis of said razor,

marginal recesses of the'same vertical depthex tending inwardlyfrom said edges, a cover plate and a blade having at least three cutting edges clamped between said guard and cover plates with its cutting edges simultaneously available for use, whereby different degrees of out are provided at the several edges of the r'azor.-

2. A safety razor of the class describedcomprising a guard plate of triangular form providing 'three straight untoothed edges which lie at different perpendicular distances from the longitudinal axis of the razor, marginal recesses of the same vertical depth extending inwardly from said edges, a cover plate of triangular form, a substantially cylindrical projection from one of said plates, recesses in said projection, a blade of triangular form providing three cutting edges, an

aperture in said blade of substantially the same shape as the cross sectional shape of said projection for co-operation with said projection, and a handle for clamping saidblade between said guard plate and said cover plate with its cutting edges simultaneously available for use, whereby different degrees of out are provided at the respective edges of said razor.

3. A safety razor as claimed in claim 1 comprising at least'one slot which extends completely through the guard plate, in the recess behind each straight edge of the guard plate for the evacuation of soap.

4; A safety razor as claimed in claim 2 comprising at least one slot which extends completely through the guard plate in the recess behind each straight edge of the guard plate for the evacuation of soap. j v I 5. A blade holder for a safety razor of the class described comprising a guard plate providing straightuntoothed edges which lie at different perpendicular distances from the longitudinal axis of said holder, marginal recesses of the same vertical depth extending inwardly from each said edge, and a cover plate for clamping a blade having" cutting edges corresponding in number to said edges of said guard plate against said guard plate for. the purpose'speclfied.

6. A blade holder for a safety razor of the class described comprising a guard plate of triangular form providing three straight untoothed edges which lie at different perpendicular distances from the longitudinal axis of the razor, marginal recesses of the same vertical depth extending inwardly from said edges, a cover plate of triangular form, a substantially cylindrical projection carried by one of said plates, recesses in said projection and a handle forclamping a blade having three cutting edges between said guard plate and said cover plate. I

7. A blade holder as claimed in claim 5 comprising at least one slot which extends completely through the recessed part behind each straight edge of the guard plate for theevacuation of soap and hair.

8. A blade holder as claimed in claim 6 com- 

